Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83540cca682983a…

MALICIOUS

PDF

68.0 KB Created: 2020-11-22 20:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 366290cc05a22f47e6e37350c4cc0fde SHA-1: 1a403e112774a297a082b74a2b3b53353fc04a79 SHA-256: a83540cca682983a17cc6ab45be46bee95b1d80dc860be66e506f7773614d29b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to direct users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?utm_term=reindeer+poop+jokes
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/5566043.pdf
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/sazigilikori.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8f7421e74b0.pdf
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/9808323.pdf
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5fb7e57680729.pdf
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/6308595.pdf
    • https://golotewojedonam.weebly.com/uploads/1/3/4/7/134767862/5429185.pdf
    • https://xegoguvaposa.weebly.com/uploads/1/3/4/6/134677344/3038374.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/8781853.pdf
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f8a864255bd8.pdf
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5f9c0aab65142.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdf
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/bigofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf09.bin
13fab1bc4a13b643e6afeac48e59090951069679af8a36156495c15aa9f7454e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 4860 bytes
font_01_sfnt_off0000dfac.bin
42dcac38bf1d3972356942588c51cafce2fdce84c5ceec143585e1077ade1e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 10552 bytes